Crop Physiology: Yield, Maturity Groups, and Growth Stages
[Pages:27]Soybean Physiology: Yield, Maturity Groups, and Growth Stages
Palle Pedersen Department of Agronomy
Iowa State University palle@iastate.edu 515-294-9905
?2003-2007 Palle Pedersen
?2003-2007 Palle Pedersen
Yield Components Compensatory Effect
Seed mass
Seed number
Seeds per pod
Pod number
?2003-2007 Palle Pedersen
Managing the soybean crop as a biomass generator
The photosynthetic process is not very efficient in the first place...
Soybean canopies convert less than 5% of the solar energy striking the earth's surface during the growing season into dry matter
?2003-2007 Palle Pedersen
(Taiz and Zeiger, 1998)
Seasonal Plant Development
Seed Filling
Seed Development
Pod Development
Phase III Maximum biomass
Flowering
Vegetative Growth
Phase II Linear biomass accumulation
Phase IV Senescence & maturation
Phase V Crop maturity
Biomass (g m-2)
Phase I Exponential biomass accumulation
?2003-2007 Palle Pedersen
Early
Late
R1
R3
R5
R7
Days after emergence
Effect of variety selection on soybean grain yield near Whiting, 2005
100.0 90.0
LSD (0.10) = 6.7 bu/acre
Yield (bu/acre)
80.0 70.0
Resistant Susceptible
60.0
50.0
40.0
?2003-2007 Palle Pedersen
Source of resistance
Correlation between Grain Yield and Seed Number near Whiting, 2005
Yield (bu/acre)
100 90 80 70 60 50 40 30 20 10 0 0
y = 0.02x + 14.108 R2 = 0.87
500
1000
1500
2000
2500
3000
3500
Seed number (# per m2)
?2003-2007 Palle Pedersen
4000
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